Coal pulverizer



July 28, 1931.

W. C. STATE COAL PULyERIZER Filed Nov. 8, 1929 2 Sheets-Shet z M/ v a63624:.

' Patented Jui 28, 1931 UNITED STATES PAT ENT OFFICE WILL 0. STATE, 01AKRON, euro 3 con. rvnvnarzna Application fled November 8, 1929. SerialNo. 405,628.

pulverize frangible substances by means of.

a centrifugal impeller, it is essential that the impeller rotate at avery high speed. The impeller rotating at such high speed, in

conjunction with the pulverized substances that necessarily collect inthe drive shaft bearings, produces excessive wear in the bearings,necessitating numerous replacements of the worn parts. Obviously thesereplacements will decrease the quantity of pulverized substancesproduced by the apparatus and will also substantially increase the costof maintaining the apparatus in an efficient operating condition.

In operating the apparatus for pulverizing frangible substancesembodying this invention, the substances are fed laterally to acentrifugal impeller, rotating in a vertical plane. The substances arepulverized against an anvil as a result of forces of impact effected bythe impeller. Means are provided to elevate the substances from theapparatus after pulverization. By means of this construction, the driveshaft is horizontally mounted in its frame and consequently,

the high speed necessary for eflicient operation of the impeller is notdestructive of the bearings for the shaft. Furthermore, means isprovided that will prevent the pulverized substances from collecting inthe bearings and .replacement of worn parts is thereby substantiallyobviated. By employing the foregoing arrangement, it is possible toincrease the production capacity ofthe apparatus and materially reduceits cost of maintenance.

For a better-understanding of the inven-- tion, reference may now be hadto the accompanying drawings, in which:

Fig. 1 is a side elevational view of. a-n'apparatus embodying theinvention;

Fig. 2 is a cross-sectional View, upon a larger scale, of the apparatusshown in Fig. 1; Fig. 3 is a cross-sectional view taken sub'- stantiallyon a line IIIIII of Fig. 2;

.Fig. 4 is a cross-sectional view taken substantially along line IVIV ofFig. 3; and Fig. 5 is a perspective view of one of the buckets.

Referring more particularly to the drawings, the apparatus is providedwith a base 10 having a motor base 11 and a support 13. An impeller 14,having a fan 15 mounted on one side thereof, is rigidly secured to ashaft- 16 which is rotatably mounted in a housing 18 by means ofbearings 19. The housing 18 is supported upon the base 10 and anadjusting screw 12-threaded into the base and the housing, supports thatportion of'the housing adjacent the bearings 19. A coupling 20 connectsa shaft 17 of a motor 21 to the shaft 16. The fan 15, rotating at thesame speed as the impeller, prevents the pulverized substances fromcollecting about the bearing 19. The impeller 14 embodies flangedannular plates 22 and 23, a wearing plate 24, including an an: nularshoulder 24a and spaced lugs-24b for positioning a plurality of buckets25 having concave surfaces 26 and 27, all of which are fastened togetherby means of bolts 28. The buckets 25 supported by the annular shoulder24a and the lugs 24b and rigidly secured by the bolts 28, are so spacedas to provide openv ings 29 therebetween. An anvil 30 supported bycooperating shoulders 31 of the anvil 30 and the housing 18 is securedto the housing 18 by means of bolts 32.

A feeding device 34, including a curved by gravity.

A conduit 39, having an enlarged portion 40, and a conduit 41 securedthereto, is mounted on the housing 18 by means of bolts 42.

- 45 and a flange 46, and is secured about the portion 40 by means ofbolts 47. A flanged conduit 49, having a'suction pump 50 with an outlet'51 attached thereto, is mounted on the separator 43 by means of bolts52. As best shown in Fig. 3, a plurality of openings 53 adjacent thebottom of the housing 18 are provided whereby a predetermined volume ofair can be admitted into the housing- Regulating dampers embodying aplurality of plates 54 are rigidly mounted on shafts 55 that areoperated by means 'of arms 56 and barsor handles 57 secured pivotally tothe ends of the arms 56.

The substances to be pulverized are fed to the impeller 14 whence theyare pulverized against the anvil 30 as a result of the forces of impacteffected by the impeller. After pulverization, the substances areelevated through the conduit 39, the separator 43 and the conduit 49, bymeans of suction created by the pump 50 and are discharged from theoutlet 51 in conjunction with the volume of air passing through theopenings 53. The separator 43 is provided for the purpose of returningto the feeding device 34 any particles not pulverized fine enough. Byproviding the tube 44 with a greater diameter than the diameter of theconduit 39, the velocity of the substances decrease when entering thesieparator 43 whereby unpulverized substances ro fee ing. device 34 bymeans of the conduit 41. By operating the bar 57, the position of theplates 54 can be so regulated that, only the volume of air necessary tocreate the suction sufficient to elevate the pulverized substance canpass through the conduit 49. A'conduit 60 having one end secured to theconduit 35 and the other end secured to the housing 18 adjacent anopenin 61 is so provided that any unpulverized su stances dropping tothe bottom of the housing 18 will be returned to the impeller by mean ofa blower 62.

From the foregoing description, it will be apparent that the inventionembraces an apparatus that is economical in operation and provides acontinuor, and uniform flow of material away from the bearings whichmight othlerwise be clogged or injured by the materia Although I haveillustrated only one formv which the invention may assume and have described in detail but a single application thereof, it will be apparentto those skilled in the art that the invention is not so limited butthat various minor modifications may be made therein. without departingfrom the spirit of the invention or from the scope of the ap endedclaims.

hat I claim is:

into the portion 40 and return to the 1.- An apparatus for pulverizingfrangible means for actuating the impeller,-means for j separating thesubstances, and means for elevating the substances after pulverization.

2. An apparatus for pulverizing frangible substances comprising ananvil, a centrifugal impeller including a plurality of buckets, eachbucket having two concave surfaces, a shaft secured to the impeller,bearings for the shaft, a fan mounted on the shaft for maintaining saidbearings free of pulverized substances, means for feeding the substancesto theimpeller, means for separating the-substances, and meansforelevating the substances after pulverization.

, 3. An apparatus for pulverizingfrangible substances comprising anannular anvil, a

centrifugal impeller including a plurality of buckets, each buckethaving two concave surfaces, a shaft secured to the impeller, bearingssupporting the shaft, a fan mounted on the shaft for maintaining saidbearings free of pulverized substances, means for feeding the substancesto the impeller, means for returning unpulverized particles to theimpeller, and means for elevating the substances after ulverization.

'4. in apparatus for pulverizing frangible substances comprising anannular anvil, a centrifugal impeller including a plurality of buckets,each bucket having two concave surfaces, a shaft secured to the impellerbearings supporting the shaft, a fan mounted 'on the shaft formaintaining said bearings free of fpulverized substances, means forlaterally ceding the substances to the impeller, meansfor separatingunpulverized particles from the substances, and means for elevating thesubstances after pulverization.

5. An apparatusfor pulverizing frangible substances comprising anannular anvil, a

centrifugal impeller rotating in a vertical I plane including aplurality of solid buckets,

each bucket having two opposed concave surfaces, a shaft secured to theimpeller bearings supporting the shaft, a fan mounted on the shaft formaintaining said bearings free'of pulverized substances, means forlaterally feeding the substances to the impeller, means for separatingunpulverized particles from the substances, means for elevating thesubstances after pulverization, and means for returning the unpulverizedsubstances to the impeller.

6. An apparatus for pulverizing frangible substances comprising anannular anvil, a

centrifugal impeller including a plurality of buckets, each buckethaving two concave surfaces rotating in a vertical plane, a shaftsecuredto the impeller, bearings supporting.

the shaft, a fan mounted on the shaft for keeping said bearings free ofpulverized substances, means for laterally feeding the substances to theimpeller, means for se arating.

unpulverized particles from the su stances, means including a pump forelevating the substances after pu for returning the unpulverizedsubstances to the impeller. v

7. An apparatus for pulverizing frangible substances comprising anannular anvil, a

centrifugal impeller rotating in a vertical ,.plane, having-a pair offlanged plates, a

wearing plate attached to one of the flanged plates, a plurality ofbuckets intermediate the wearing plate and one ofthe flanged plates, ashaft. secured to the impeller, bearings supporting the shaft, a fanmounted on the shaft for kee ing said bearings free from ulverized-sustances, means for laterally eeding, the substances to the impeller,means for separating unpulverized particles from the substances, meansincluding a pump for elevating the .sub-

stances after pulverization, and means for returning unpulverizedsubstances to the impeller.

In witness whereof,I have hereunto signed my name.

Signed at Akron, in the county of Summit and State'of Ohio, U. S. A.,this 4th day of November, 1929.

' WILL C. STATE.

verization, and means

